I'll just say this about second hand in general.
I think that as in many other devices people hang onto readers after they've graduated to the next generation.
I get the impression that the second hand market is not too vibrant for lower end devices.
Yes, if you want to spend $500 for a very well-kept, high-end device there are offers.
OTOH, some wackoes want $90 for a device with a broken screen.
https://www.ebay.com/itm/256210451037
Maybe you should just canvas your friends to find somebody who has one in a drawer?
Then you could get some up-to-date experience and decide if you want to drop some money.